/Engine/Plugins/Editor/ObjectMixer/ObjectMixer/Source/ObjectMixer/Public/Views/List/Modes/ObjectMixerOutlinerMode.h
If OutlinerIdentifier is not set for this outliner, it is not possible to store settings.
The config for this ActorBrowser.
[FObjectMixerOutlinerModeConfig](API\Plugins\ObjectMixerEditor\Views\List\Modes\FObjectMixerOutlinerModeConfig) * GetMutableConfig() const